Top 311 Show HN Open-Source Projects & Libraries (May 2026)
launchesBrowse newly launched open-source repositories, developer libraries, and community software in May 2026. Use this list to explore open-source tools.
Hacker News Digests — May 31, 2026
https://openwarp.zerx.dev— OpenWarp
https://selectandtranslate.z7.web.core.windows.net— SelectAndTranslate – Build vocabulary from anything you read (free)
https://hype.replicate.dev— Hype: List of latest ML Python repos,models and subreddits
https://wesearch.press— WeSearch – Anonymous news aggregator with no algorithm, 700 sources
https://ghost.charity— GhostBox – disposable little machines from the Global Free Tier.
https://privatepdf.eu— A single HTML file that organizes your PDF pages locally, mobile friendly
https://keepthingsopen.com— An open letter asking NHS England to keep its code open
https://sanishne.org— Sanishne – shared bookmarks for teams (so links don't vanish in Slack)
https://agentpersonalityscore.com— Agent Personality Score
https://fixiproject.org— The Fixi Project
https://billnode.app— Billnode – six tiny calculators for freelancers and small ecom shops
https://agsist.com— Agsist – free real-time grain market dashboard for US producers
https://forge.foxtrotcommunications.net— Open-Source FHIR –> OMOP Pipeline
https://pgadmin.org— PgAdmin: The Most Popular PostgreSQL Admin Tool
https://toggles.tinytown.studio— Toggles – open-source feature flags for everyone
https://world-ai-agents.com— World AI Agents–35 AI Models (Claude, GPT, Llama)via One OpenAIcompatible API
https://threej.in— Threej games – open-source gaming portal
https://databasus.com— Databasus: Free, open source tool to backup PostgreSQL
https://agentfriendlycode.com— Which public repos are friendliest to an AI coding agent?
https://simplebanking.de— Simplebanking: German open-source banking in your Mac menu bar (with CLI/MCP)
https://seodata.dev— Seodata.dev – free search volume data to see search demand for your projects
https://fundsimulate.com— FundSim – free browser LBO, DCF and IB deal simulator (no signup)
https://visrank.org— I built a free SEO/AEO/security scanner for websites
https://myriad-project.org— The Myriad Project: A separator for ten-thousands
https://hglab.io— Free Mercurial Hg Hosting at Hglab.io
https://zentty.org— ZenTTY – A terminal that gets out of your way
https://seekerscore.com— Seeker – Career Routing Engine
https://getspeq.com— Speq – A collaborative web-based repository for your product's spec
https://esdm.io— Event-Sourced Domain Modeling
https://stackgraveyard.dev— StackGraveyard.dev – Live mortality scores for NPM packages
https://sourcery-deep-research.pagey.site— Sourcery – Open Deep-Research, Grounded in Evidence
https://openinbox.io— Real inbox deserves better Temp emails with full API access and webhooks
https://megallm.netlify.app— MegaLLM – Universal LLM client for any OpenAI-compatible API
https://letsbuyspirit.com— Letsbuyspirit.com – Crowd Sourced Airlines
https://syssimulator.com— SysSimulator: System design simulator in Rust/WASM, free, No login
https://myfreecalendar.app— I got tired of messy PTO spreadsheets, so I built a simple tool
https://palantirwatch.org— Open source intelligence about Palantir
https://reflowpdf.com— ReflowPDF – wrote a layout engine because every PDF library failed
https://bluchan.org— Bluchan.org – Anonymous Free Speech Forum
https://cozy.talk— Cozy.Talk – Old web inspired discussion community
+ 271 more verified launches in full dataset...
Key Launch Stats (Show HN Open-Source Repositories — May 2026)
During May 2026, a total of 311 product launches were recorded in this category up to 2026-05-31.
Here is a quick look at launch activity and naming characteristics:
- Total Launches: 311 domains
- Busiest Launch Day: 2026-05-27 (17 launches)
- Average Domain Name Length: 9.6 characters
- Shortest Domain: hf.space
- Longest Domain: endpointcontextprotocol.io
- Clean / Single-Word Domains: 89.7%
- Common Name Prefixes: open (21), ai (6), get (4), the (3), my (2)
- Common Keywords: ai (85), app (40), ui (30), agent (27), dev (23)
How to Use This Data
You can use this list of Hacker News and builder releases to find emerging tools, track indie projects, or connect with early-stage builders.
To browse or download the full master dataset of 15,500+ startup launches in CSV and JSON formats, visit the Launches Master Dataset.